| Message ID | 1449578860-15808-3-git-send-email-zhaoshenglong@huawei.com |
|---|---|
| State | New |
| Headers | show |
On Tue, Dec 08, 2015 at 01:37:14PM +0000, Marc Zyngier wrote: > On 08/12/15 12:47, Shannon Zhao wrote: > > From: Shannon Zhao <shannon.zhao@linaro.org> > > > > Here we plan to support virtual PMU for guest by full software > > emulation, so define some basic structs and functions preparing for > > futher steps. Define struct kvm_pmc for performance monitor counter and > > struct kvm_pmu for performance monitor unit for each vcpu. According to > > ARMv8 spec, the PMU contains at most 32(ARMV8_MAX_COUNTERS) counters. > > > > Since this only supports ARM64 (or PMUv3), add a separate config symbol > > for it. > > > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > > --- > > arch/arm64/include/asm/kvm_host.h | 2 ++ > > arch/arm64/kvm/Kconfig | 8 ++++++++ > > include/kvm/arm_pmu.h | 40 +++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 50 insertions(+) > > create mode 100644 include/kvm/arm_pmu.h [...] > > diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig > > index a5272c0..66da9a2 100644 > > --- a/arch/arm64/kvm/Kconfig > > +++ b/arch/arm64/kvm/Kconfig > > @@ -36,6 +36,7 @@ config KVM > > select HAVE_KVM_EVENTFD > > select HAVE_KVM_IRQFD > > select KVM_ARM_VGIC_V3 > > + select KVM_ARM_PMU > > What if HW_PERF_EVENTS is not selected? Also, selecting HW_PERF_EVENTS > is not enough, and you probably need PERF_EVENTS as well, So this should > probably read: > > select KVM_ARM_PMU if (HW_PERF_EVENTS && PERF_EVENTS) HW_PERF_EVENTS depends on ARM_PMU which in turn depends on PERF_EVENTS. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On 2015/12/8 22:10, Marc Zyngier wrote: > On 08/12/15 13:53, Will Deacon wrote: >> On Tue, Dec 08, 2015 at 01:37:14PM +0000, Marc Zyngier wrote: >>> On 08/12/15 12:47, Shannon Zhao wrote: >>>> From: Shannon Zhao <shannon.zhao@linaro.org> >>>> >>>> Here we plan to support virtual PMU for guest by full software >>>> emulation, so define some basic structs and functions preparing for >>>> futher steps. Define struct kvm_pmc for performance monitor counter and >>>> struct kvm_pmu for performance monitor unit for each vcpu. According to >>>> ARMv8 spec, the PMU contains at most 32(ARMV8_MAX_COUNTERS) counters. >>>> >>>> Since this only supports ARM64 (or PMUv3), add a separate config symbol >>>> for it. >>>> >>>> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> >>>> --- >>>> arch/arm64/include/asm/kvm_host.h | 2 ++ >>>> arch/arm64/kvm/Kconfig | 8 ++++++++ >>>> include/kvm/arm_pmu.h | 40 +++++++++++++++++++++++++++++++++++++++ >>>> 3 files changed, 50 insertions(+) >>>> create mode 100644 include/kvm/arm_pmu.h >> >> [...] >> >>>> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig >>>> index a5272c0..66da9a2 100644 >>>> --- a/arch/arm64/kvm/Kconfig >>>> +++ b/arch/arm64/kvm/Kconfig >>>> @@ -36,6 +36,7 @@ config KVM >>>> select HAVE_KVM_EVENTFD >>>> select HAVE_KVM_IRQFD >>>> select KVM_ARM_VGIC_V3 >>>> + select KVM_ARM_PMU >>> >>> What if HW_PERF_EVENTS is not selected? Also, selecting HW_PERF_EVENTS >>> is not enough, and you probably need PERF_EVENTS as well, So this should >>> probably read: >>> >>> select KVM_ARM_PMU if (HW_PERF_EVENTS && PERF_EVENTS) >> >> HW_PERF_EVENTS depends on ARM_PMU which in turn depends on PERF_EVENTS. > Yeah, this is the reason why I choose HW_PERF_EVENTS. > in which case, let's make it: > > select KVM_ARM_PMU if HW_PERF_EVENTS > Sure, will do. > which should give us the minimal chain. I hate the kernel config > language! ;-) > > M. > -- Shannon _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index a35ce72..42e15bb 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -37,6 +37,7 @@ #include <kvm/arm_vgic.h> #include <kvm/arm_arch_timer.h> +#include <kvm/arm_pmu.h> #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS @@ -132,6 +133,7 @@ struct kvm_vcpu_arch { /* VGIC state */ struct vgic_cpu vgic_cpu; struct arch_timer_cpu timer_cpu; + struct kvm_pmu pmu; /* * Anything that is not used directly from assembly code goes diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index a5272c0..66da9a2 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -36,6 +36,7 @@ config KVM select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD select KVM_ARM_VGIC_V3 + select KVM_ARM_PMU ---help--- Support hosting virtualized guest machines. We don't support KVM with 16K page tables yet, due to the multiple @@ -48,6 +49,13 @@ config KVM_ARM_HOST ---help--- Provides host support for ARM processors. +config KVM_ARM_PMU + bool + depends on KVM_ARM_HOST && HW_PERF_EVENTS + ---help--- + Adds support for a virtual Performance Monitoring Unit (PMU) in + virtual machines. + source drivers/vhost/Kconfig endif # VIRTUALIZATION diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h new file mode 100644 index 0000000..dea78f8 --- /dev/null +++ b/include/kvm/arm_pmu.h @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2015 Linaro Ltd. + * Author: Shannon Zhao <shannon.zhao@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ASM_ARM_KVM_PMU_H +#define __ASM_ARM_KVM_PMU_H + +#include <linux/perf_event.h> +#ifdef CONFIG_KVM_ARM_PMU +#include <asm/pmu.h> +#endif + +struct kvm_pmc { + u8 idx;/* index into the pmu->pmc array */ + struct perf_event *perf_event; + u64 bitmask; +}; + +struct kvm_pmu { +#ifdef CONFIG_KVM_ARM_PMU + /* PMU IRQ Number per VCPU */ + int irq_num; + struct kvm_pmc pmc[ARMV8_MAX_COUNTERS]; +#endif +}; + +#endif